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RoboVM fork of Soot - A Java optimization framework
There is a newer version: 2.5.0-9
/* Soot - a J*va Optimization Framework
 * Copyright (C) 2002 Florian Loitsch
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */


package soot.toolkits.scalar;

import java.util.*;

/**
 * gives an injection of Objects to ints. Different instances of
 * ObjectIntMap may map different ints to the same object.
 */
public class ObjectIntMapper {
  private Vector intToObjects;
  private int counter;
  private Map objectToInts;
  
  public ObjectIntMapper() {
    intToObjects = new Vector();
    objectToInts = new HashMap();
    counter = 0;
  }

  public ObjectIntMapper(FlowUniverse flowUniverse) {
    this(flowUniverse.iterator(), flowUniverse.size());
  }

  public ObjectIntMapper(Collection collection) {
    this(collection.iterator(), collection.size());
  }

  private ObjectIntMapper(Iterator it, int initSize) {
    intToObjects = new Vector(initSize);
    objectToInts = new HashMap(initSize);
    counter = 0;
    while (it.hasNext())
      add(it.next());
  }

  /**
   * adds o into the map. no test are made, if it is already in the
   * map.
   */
  public int add(E o) {
    objectToInts.put(o, counter);
    intToObjects.add(o);
    return counter++;
  }

  /**
   * returns the mapping of o. if there has been a call to
   * objectToInt with the same o before, the same
   * value will be returned.
   *
   * @param o
   * @return o's mapping
   */
  public int getInt(E o) {
    Integer i = objectToInts.get(o);
    if (i != null) return i;
    return add(o);
  }

  /**
   * returns the object associated to i.
   *
   * @param i
   * @return i's object
   */
  public Object getObject(int i) {
    return intToObjects.get(i);
  }

  /**
   * returns true, if o has already been mapped.
   *
   * @param o
   * @return true if o has already a number.
   */
  public boolean contains(Object o) {
    return objectToInts.containsKey(o);
  }

  /**
   * returns the number of mapped objects.
   */
  public int size() {
    return counter;
  }

}